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Both disks 2 and 3 appear to be failing, though these errors can be intermittent, similar to disk1 errors when it was almost new, and no more since, I would recommend running an extended SMART test, and run it on all disks since others are also showing some warning signs, most raw read errors, then post new diags

Why do you say "later"? Certainly they have to be done one at a time but if by later you mean some time in the not so near future then you need to be aware that any disk not working well compromises any protection you have from parity.

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You might have to turn on the Array Status notification to get messages about simple I/O errors that don't result in SMART warnings or disabled disks, like what you have experienced. But the status notification only goes out on schedule instead of instantly.

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Your best bet would likely be to add a 2nd parity drive now, if there are just a few read errors on each disk they likely won't be on the same sectors, so with a little luck parity2 could build 100% successfully, though there's a small change that a disk could become disable, but they are much more likely to error on read then on writes, so IMO there's a good chance it would work.

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You might have to turn on the Array Status notification to get messages about simple I/O errors that don't result in SMART warnings or disabled disks, like what you have experienced. But the status notification only goes out on schedule instead of instantly.

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Yes that is telling you about the read errors. Often those don't really indicate a bad disk though. Usually it is something else like the connection. But you could take that as an indication that you should investigate further and maybe run an extended SMART test. I guess sometimes the monitored SMART attributes aren't enough to know for sure if a disk is healthy.

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That means there will be some corruption on the rebuilt disk, that will in turn cause corruption when rebuilding disk3, still thing you should have tried to add parity2, you'd likely been able to replace both disks without errors.